By ensuring the correct air-to-fuel ratio

high-tension lead

provided the inlet pressure does not exceed 0

pressure switches

Siemens Building Technology 141-0520 Temperature Control R-410A By ensuring the correct air-to-fuelThe Siemens 141 0520 is a rugged, line voltage remote bulb thermostat designed for high accuracy temperature regulation in commercial HVACR applications. Engineered as a two position electric controller, this unit features a single pole, double throw (SPDT) snap acting switch housed in a heavy duty gray baked enamel galvanized steel casing. With a temperature range of 20F to 120F and an adjustable differential of 3. 5F to 14F, it provides precise on